“Their message: No tyrant will ever end the struggle for justice,” he added.

The Arbaeen mourning ceremony is one of the largest religious gatherings in the world. It marks the 40 days of mourning after the martyrdom anniversary of the grandson of Prophet Mohammad (PBUH), Imam Hussein (AS), the third Imam of the Shia Muslims.

Every year millions of Iranians travel to the holy cities of Iraq to make an Arbaeen pilgrimage. This year Arbaeen falls on October 30.